﻿// --------------------------------------------------------------------------------------------------------------------
// <copyright file="LengthConverter.cs" company="PropertyTools">
//   The MIT License (MIT)
//   
//   Copyright (c) 2014 PropertyTools contributors
//   
//   Permission is hereby granted, free of charge, to any person obtaining a
//   copy of this software and associated documentation files (the
//   "Software"), to deal in the Software without restriction, including
//   without limitation the rights to use, copy, modify, merge, publish,
//   distribute, sublicense, and/or sell copies of the Software, and to
//   permit persons to whom the Software is furnished to do so, subject to
//   the following conditions:
//   
//   The above copyright notice and this permission notice shall be included
//   in all copies or substantial portions of the Software.
//   
//   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
//   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
//   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
//   IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
//   CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
//   TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
//   SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
// </copyright>
// --------------------------------------------------------------------------------------------------------------------

namespace PropertyGridDemo
{
    using System;
    using System.Globalization;
    using System.Windows;
    using System.Windows.Data;

    using ExampleLibrary;

    [ValueConversion(typeof(Length), typeof(string))]
    public class LengthConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value == null)
            {
                return null;
            }

            try
            {
                var length = (Length)value;
                return length.ToString(string.Empty, culture);
            }

            catch
            {
                return DependencyProperty.UnsetValue;
            }
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value == null)
            {
                return null;
            }

            try
            {
                var s = (string)value;
                return Length.Parse(s, culture);
            }
            catch
            {
                return DependencyProperty.UnsetValue;
            }
        }
    }
}